Mass to mole

via
formula mass

Atoms are so small that to weigh one of them is meaningless. The individual weight of an atom is so small that it is insignificant. We use special units when we talk about an atom's atomic mass, the atomic mass units. The atomic mass of an atom is usually made up of the nuclear particles, the neutrons and protons.

For example the mass of:

carbon "C" is 12 atomic mass units:.
hydrogen "H" is 1 atomic mass unit;
nitrogen "N" is 14 atomic mass units;
oxygen "O" is 16 atomic mass units.

One mole or 6 X 10²³ atoms of any element weighs its atomic mass expressed in grams. WHAT? Let me explain.
Carbon has an atomic mass of 12 atomic mass units, so 6 X 10²³ carbon atoms weigh 12 grams. Let's continue:
Hydrogen has an atomic mass of 1 atomic mass unit, so 6 X 10²³ hydrogen atoms weigh 1 gram.
Nitrogen has an atomic mass of 14 atomic mass units, so 6 X 10²³ nitrogen atoms have a mass of 14 grams.
Oxygen has an atomic mass of 16 atomic mass units, so 6 X 10²³ oxygen atoms weigh 16 grams.

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